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c.R.To MPK1Ns, or RocHEsAT-,E n, NEW YORK. Letters Patent No. 70,051,dated October 22, 1867.

IMPROVEMENT IN MORTISING M'AGHINES.

T0 ALL WHOM IT MAY CONCERN:

Be it known that I, C. R. TOMPKINS, of Rochester, in the county ofMonroe, and State of New York, have invented certain new and usefulImprovements in Mortising Maehincs;" and I do hereby declare that thefollowing is afull, clear, and exact description thereof, referencebeing had to the accompanying drawings, making part of thisspecification, in whichv Figure 1 is a side elevation of my inventionapplied to a-n ordinary mortising machine,` al portion of the framebeing broken away to show the relative arrangement of the parts. Y

Figure 2 is a. detached view ofthe rateheted reversing-barrel, sleeve,and collars.

Figure 3 is a plan ofthe ratchet `or clutching collar.

Figure 4 is a top view 'of the head or flange 0l, showing the notches uinto which the V-shaped head of tho clutch t takes. n

` Like letters of reference indicate like parts.

This invention relates to that class of mortising machines having anautomatically reversing chisel-stock; and its nature consists in theemployment of such an arrangement of devices as will cause thechisel-stock to retain a fixed position upon its axis until the chiselis entirely withdrawn from the timber, when it will be reversed by theextreme downward movement of the table.

To enable others to make and use my invention, I willv describe itsconstruction and operation.

I provide a chisel-stock or mandrel, M, with a feathered sleeve, S. Thissleeve has two heads or collars, b and d, between which it has itsjournal-bearing in the box B. -The upper portion of the sleeve isencircled by a. loose barrel, R, which is secured to the sleeve by acollar, f, and set-screw s, iig. 2. The point of this screw- .may bemade to act as the feather, by entering the slot or groove in the shaftor stock M, as shown, or an ordinary feather or key may be applied tothe sleeve. The barrel R is provided with a spiral g1oove,g, (fig. 1,)in which the end of the lever D moves'.` I place Iaratchet catchor-pawl,a, `in the lower end of the barrel R, as shown in ig. 2. It is forceddown by a suitable spiral spring, n, and catches in the recesses ornotches o made in the upper face of the collar b, as shownin figs. 2 and3. The lower headcl of the sleeve S has two v-shaped notches in itsperiphery, into either of which the corresponding shaped edge of thelocking-boltt is forced by the spring o, iig. '1. The chisel-stock isswivelledv to the cross-head The adjusting-rod E passes through thelever D, and is provided with a spiral spring, J, the lower nd of whichrests upon` the lever, and the upper end against the set-nut r. rI helever is hinged to the frame `of the machine -by the rockshaft F. Thereis an adjustable locking-bar, y, through which the llever D passes, thebar being slotted to receive it. The chiselmandrel or stock isreciprocated by the pitman P from the ily-wheel W. When themortising-table T descends,-

the spring J is gathered o1' compressed untilth coils are a'll closedtogether, which may be made by set-nut, r, to take place just before thetable sha-ll lhave reached the limit ,of its downward throw, andthespring thus i becoming rigid forces the bar or lever'AD down, and thebarrel R to turn, by forcing the c lutcht to release the i head d, andthe expansion of the spring vdrives thc end ofthe lever down 'tothelower end of the spiral groove g. The locking-latchhaving already`fallen with its wing e, before the pin t', which prevents thepossibility of the head t failing to catch in the notch inthe head d.When theV table Works up to the position shown in fig. 1, the barrel Ris turned backward, and the'ratchet acatches in the opposite notch, andthe locking-latch y is raised, as shown, releasing the p'in c, which`will pass under the wing e before the latch drops at thenext descent ofthe table, the chisehstock` being firmly-held in thc mean time inposition by the head or catch t. The nntp may be made adjustable uponthe rod E, to admit of the necessary changes in the elevation of themortisingtable T.

What I claim as my invention, and desire to secure by Letters Patent,is-

The arrangement of the adjustablespring-frod E, lever D, reversingscroll-collar R, collared sleeve S, with its projections z', locking-bary, and the spring catch t, substantially in the manner and for thepurposcsherein shown and described.

i C. R. .EOMPKINS.

Witnesses: i

WM. S. LoUGnBonoUen, FRED. A. HATCH.

